Muffler for internal combustion engines



March 7', 1933. RADECKY 1,900,026

IUP'PLER FOR INTERNAL COMBUSTION ENGINES Filed May 18, 1929 Patented .Mar. 7, 1933 UNITED STATES PATENT OFFICE EDWARD H. nAnncK-Y, or enn'rnorr, MICHIGAN, assrenon To THE MURRAY 'conro- BATION oF'AMnnIcri, A conroRATIon or DELAWARE MUFFLER FOR INTERNAL COMBUSTION ENGINES Application filedMay 18, 1929. Serial No; 364,138.

An object of my invention is to provide a muflicr for an internal combustion engine which is cheap to manufacture, and simply assembled,and in which the parts are all rigidly held against working loose and rattling.

Another objectof my invention is to provide such a muffler composed of substantially uniform parts throughout. I

Another object of my invention is to provide a mufller for an'internal combustion en gine which is divided into substantially three compartments comprising an intake compartment and an outlet compartment, and an ultimate expansion and cooling compartment surrounding both said intake and outlet compartment and communicating with each of them. 7 i

Another object of my invention is to provide a mufller comprising three concentrically arranged tubes in which the two inner tubes are separated by bafi'les into inlet and outlet compartments and in which the outer tube surrounds the inner tubes and forms a communicating path between them and in which the flow of gases from the inlet to' the outlet'compartment are controlled by the area of passages between the inlet compartment and theouter tube and between the outer tube and the outlet compartment, the total area of passages between the outer tube and the outlet compartment being slightly less than the total area of passages between the inlet compartment and the outer tube, wherehythe reduction in volume of gases by cooling and condensation is compensated for and'suflicient pressure is maintained in the outlet compartment to eflectively offset the tendency of air to rush into the mufiier through the outlet pipe when the engine is decelerated, and thereby eliminate drumming when the volume of exhaust gas from the engine is suddenly diminished. f

With these andother objects in view, my invention consists in the arrangement, combination and construction of the various parts of my improved device, as described in the specification, claimed in my claim, and shown in the accompanying drawing, in which: 1

Fig. 1 is a longitudinal cross section of my muiiler having parts broken away tozillustrate the construction of the various'parts':

Fig. 2 is a view taken on the line 22 of Fig. 1. j

Fig. 3 is a view taken on the line 33 of Fig. 1. v

. The mufiler comprises three concentric tubes 10, 11, and 12, 10 being the outer tube or casing, 11 beingthe intermediate tube, and

12 being the inner tube. Head pieces 13. are

provided for each end of the muffler and comprise plates having lateral shoulders formed thereon adapted to support the ends of the tubes in spaced concentric relation to each other. The head pieces 13, one of which is applied to each end of the muflierjmay'be identical and are provided with central openingsin which the engine exhaust pipe 1 1 and the tailpipe 15 may besecured. The tubes.

10, 11 and 12 each extendthe full length of the muifler, although they are of different lengths inorder to lit the shoulders on the head pieces 13. Intermediate the ends of the mufiier the inner tube 12 is divided into two compartments of substantially equal capacity bythe circular baflle 16, which is a concave plate having lateral flanges formed thereon which are attached to the sides of the tube 12 by welding or othersuitahle means, The intermediate tube 11 is also dividedinto two compartments by the baffle plate 17 which comprises a circular plate having a central opening of the proper size to fit closely 5 around the outside diameter of the inner tube 12. Around this-central opening'in'the baflle 17 is. formed a lateral flange 18 which is welded to the outside of theinner tube 12 at a point opposite the position of the lateral attaching flange on the baffle plate 16 which is secured to the inside of the tube 12. The outer edge of the baffle 17 is also formed with a laterally extending flange 19 which is secured by a press fit orother suitable means to the wall of the intermediate tube 11. All of the tubes 10, Hand 12 are secured at their ends to the head pieces 13 and the exhaust pipe 14 is suitably secured in the central opening in the inlet head. The tail pipe 15 is likewise secured in the central opening of the outlet head piece 13, or may be formed as an i 9 formityand smallnumber of parts, cheap to integral part thereof when the piece is drawn.

A plurality of holes are formed in the inner tube 12 and in the intermediate tube 11 on the left or inlet side of the baffles'16 and 17.

"On the right or outlet side of the baffles 16 and 17 a plurality of holes are formedin the intermediate tube 11 and likewise a plurality are formed in the inner tube-12. However,

the total area of the holes in this right end of ithetube 11 are slightly less than the total area of the holes in the left 'end'ol the tube 11,

'andthe total area of the holes in the tube 12 to the right ofthe bafiie 16 is slightly less than the total area of theholes in the right end of thetube 11; However; this arrangement may be varied to suit conditions so long as the total area of the holes or'passagesin i the right or outlet ends of tubesll and 12" I are less than the total area ofthe holes-inthe I inlet ends.

'Gas entering through the exhaust pipel l I strikes the left or concave side of the balile l6 and passes through the holes in" the 'left;

i I end of the b 19 t e 'end of the tube Which is commensurate ith the appended claim.

What I claim is:

V A muiller for an internal combustion engine. comprising three tubes arranged in spaced concentric" relation to each other, a pair of head pi ces'supporting the ends of saidtubes and havingcentral openings lead ing to each end of the inner tube, baflie plates 1 secured intermediate the ends of the inner and intermediate tubes filfil'CllfflCllllg each of capacity, said inner and intermediate tubes having lateral passages therethrough on the inlet side of said baffle plates, andsaidinter mediate'tube' having lateral passages on the outlctside of said baflle plates of lesser area than'on the inlet side, and said lnner tube them into two chambers of substantially equal havingclateral passages on the out-let side of lesser total area than the 'corr'espondingpassages 1n said'intermediate tube. 1

V EDVVARD HFRADECKY,

v 11 and through the holes therein into the outer tube 10. The gas, during this process, is expanded, and When it passes into the outer tube 10, Which, owing-to'its direct contact Withthe air is generally cooler than either of the tubes 11"or'12, Will effect a cooling 7 of the exhaust gases and a slight condensation andslowing upofexpa'nsion, and the reduction of the area of the passages leading from pressure are'a'within themulilerupondecelthe outer tube 10 through the right end of the intermediate tube 11," and the right end of the intermediate tube 12, Willcause a sufiicient back pressure in the outer tube 10 and in the inlet endsof the tubes 11 and12 to oleaden the impulses of incoming gas, and will also build up a sufiicient pressure to'provide a v comparatively steady fiovvoi exhaustgasfrom i theouter tube 10 into the rightor'outlet ends of the tubes '11 and 12, Which Will continue for-a short interval after the deceleration of V the engine, and will thus provide a steady pressure in the outlet endof the muflier which Will tend tofpre'vent the formation of a 10W erati'on of the engine, WlilCllWOlllCl cause air to rush intothe muffierand produce anus- V leasant drummingsound. The construc- V gree Which materiallyafiectsthe operationof it the engine. It is also, 'on'account of theuni produce.

cific embodiment of the invention described without departing trom the spirit or subi stance of the broad rinventiongthe scope of a a Formal changes'may be'made in' the spe 

